Self-Assembled Monolayers as Templates for Linearly Nanopatterned Covalent Chemical Functionalization of Graphite and Graphene Surfaces

Kazukuni Tahara*, Toru Ishikawa, Brandon E. Hirsch, Yuki Kubo, Anton Brown, Samuel Eyley, Lakshya Daukiya, Wim Thielemans, Zhi Li, Peter Walke, Shingo Hirose, Shingo Hashimoto, Steven De Feyter, Yoshito Tobe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

An approach for nanoscale covalent functionalization of graphite surfaces employing self-assembled molecular monolayers of n-alkanes as templating masks is presented. Linearly aligned aryl groups with a lateral periodicity of 5 or 7 nm are demonstrated utilizing molecular templates of different lengths. The key feature of this approach is the use of a phase separated solution double layer consisting of a thin organic layer containing template molecules topped by an aqueous layer containing aryldiazonium molecules capable of electrochemical reduction to generate aryl radicals which bring about surface grafting. Upon sweeping of the potential, lateral displacement dynamics at the n-alkane terminal edges acts in conjunction with electrochemical diffusion to result in templated covalent bond formation in a linear fashion. This protocol was demonstrated to be applicable to linear grafting of graphene. The present processing described herein is useful for the realization of rationally designed nanoscale materials.

Original languageEnglish
Pages (from-to)11520-11528
Number of pages9
JournalACS Nano
Volume12
Issue number11
DOIs
StatePublished - 27 Nov 2018

Keywords

  • aryldiazonium salts
  • electrochemistry
  • graphene
  • graphite
  • self-assembled monolayers
  • templated covalent functionalization

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